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J Sci Med Sport. 2019 Aug 7. pii: S1440-2440(19)30135-5. doi: 10.1016/j.jsams.2019.07.014. [Epub ahead of print]

Validity and reliability assessment of 3-D camera-based capture barbell velocity tracking device.

Author information

1
Nebraska Athletic Performance Laboratory, University of Nebraska-Lincoln, USA; Department of Biological Systems Engineering, University of Nebraska-Lincoln, USA. Electronic address: ctomasevicz2@unl.edu.
2
Nebraska Athletic Performance Laboratory, University of Nebraska-Lincoln, USA.

Abstract

Velocity-based training (VBT) requires the monitoring of lift velocity plus the prescribed resistance weight. A validated and reliable device is needed to capture the velocity and power of several exercises.

OBJECTIVES:

The study objectives were to examine the validity and reliability of the Elite Form Training System® (EFTS) for measures of peak velocity (PV), average velocity (AV), peak power (PP), and average power (AP).

DESIGN:

Validity of the EFTS was assessed by comparing measurements simultaneously obtained via the Qualisys Track Manager software (C-motion, version 3.90.21, Gothenburg, Sweden) utilizing 6 motion capture cameras (Oqus 400, 240 Hz, Gothenburg, Sweden).

METHODS:

Six participants performed 6 resistance exercises in 2 sessions: power clean, dead lift, bench press, back squat, front squat, and jump squat.

RESULTS:

Simple Pearson correlations indicated the validity of the device (0.982, 0.971, 0.973, and 0.982 for PV, AV, PP, and AP respectively) and ranged from 0.868 to 0.998 for the 6 exercises. The test-retest reliability of the EFTS was shown by lack of significant change in the Pearson correlation (<0.3% for each variable) between the 2 sessions. The multiple count error rate was 2.0% and the missed count error rate was 2.1%.

CONCLUSIONS:

The validity and reliability of the EFTS were classified as excellent across all variables and exercises with only one exercise showing a slight influence by the velocity of the movement.

KEYWORDS:

Bench press; Power clean; Resistance training; Squat; Strength and conditioning; Velocity-based training

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